package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import javax.websocket.Session;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 发送手机验证码
     * @param phone
     * @param session
     * @return
     */
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合，返回错误信息
            return Result.fail("手机格式错误！");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到session
        //session.setAttribute("code",code);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue()
                .set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL,TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("发送短信验证码成功，验证码{}",code);
        return Result.ok();
    }

    /**
     * 登录功能
     * @param loginForm
     * @param session
     * @return
     */
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //不符合，返回错误信息
            return Result.fail("手机格式错误！");
        }
        // 3.从Redis校验验证码
        //Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        String code = loginForm.getCode();
        if(cacheCode==null || !cacheCode.equals(code)){
            //不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if(user==null){
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        //7.保存用户信息到session
        //session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //7.保存用户信息到redis中
        //随机生成token，用作登录令牌
        String token = UUID.randomUUID().toString(true);
        //TODO 不会：将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //存储
        String tokenKey = LOGIN_USER_KEY+token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX +RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
